Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa09f437acb7f22b…

MALICIOUS

PDF

73.2 KB Created: 2021-03-12 02:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 73457955a9e522f7a2fabfd108eba9d6 SHA-1: db723931cf17ba812682375076792b43502f3036 SHA-256: fa09f437acb7f22b2432f1c64487b9aec314ea44b907bd6f59ca4d8a36ea239a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links to external websites, many of which appear to be part of an SEO link farm. The document's content, though heavily obfuscated, suggests a lure related to 'emotions in English PDF'. The ML classifier strongly indicates maliciousness, and the presence of multiple disposable hosting domains further supports this assessment. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/award?keyword=list+of+emotions+in+english+pdf PDF link annotation
    • http://fipagolanikobax.mygamesonline.org/82289362920.pdfIn PDF document text
    • http://somirolixikaf.iblogger.org/jasigijasekonutizisab.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/sibosuwo.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/083deb81534c.pdfIn PDF document text
    • http://wamawogep.iblogger.org/create_list_of_sheet_names_vba.pdfIn PDF document text
    • http://temilops.xyz/1721763727vwbil.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/76502558496.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/4381104.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/kanek.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/menobaminoxikib.pdfIn PDF document text
    • http://discovljzg.fun/kozutxa6cg.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/fevebuku-zadevi-dafewulixiv.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/8757837.pdfIn PDF document text
    • https://sexewowoko.weebly.com/uploads/1/3/0/8/130873923/16b00.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/1959188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivewurunowu.rf.gd/arobnjak_iz_oza.pdfIn PDF document text
    • http://nenidexixod.epizy.com/sazap.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/68241639603.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 5092 bytes
SHA-256: 97a5be71bd150a53c2e6f9056ec03cb4b8267049abb52595d621d48b47ef8385
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10240 bytes
SHA-256: 87ad5bc0017613f78d09b8599bb4c958e120e1359a753cd1225d0dc82fd6a45f

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